Projector slide



June 2, '1936. E. s. KING PROJECTOR SLIDE Filed July 8, 1955 Patented June 2, 1936 UNITED 'STATES PATENT oFFlcE rnomc'roa sLmE Edward s. chicago', nl. Application July s, 1935, serial No. 30,225

' 'z claims. (ci. 213-141) A further object aims at providing a slide .l wherein the spinner is electrically operated.4

A still further object aims at providing a slide wherein the spinner plays over a series of graduations or indexes, there being means. to cause the spinner to come to a dead stop opposite an index' l after the spinner ceases to'be actuated.-

. Otherv equally important objects will become apparent from a perusal of the invention, which comprisesthe means described in the following specification, particularly set forth in the claims forming a part thereof and illustrated in the accompanying drawing, in which Fig. 1 is an elevational view of my improved device and associated parts.

Fig. 2 is an enlarged front view of the slide 26 proper.

, Fig. 3 is an enlarged section on the line 3-3 of Figure 2.

- Fig. 4 is a section on the line 4-4 of Figure 2.

Fig. 5 is a front. view of the armature emlployed 80 for actuating the spinner.

Referring to the several views in the drawing, the slide generally designated by I0 comprises two rectangular. transparent plates II and I2,

' which may be of glass or any other transparent 3 5 material suitable for the purpose for which they l are intended. Interposed between the transparent plates is an armature I3 which is of tire'4 same configuration asthe transparent plates but is provided with stamped out portions to provide 40 poles I 4 which are separated by air gaps I5 and are integral with armsA I6 stamped out from the armature I3.

The armature I3 has wound around its arm I6 eld coils I1 which are interconnected as will be readily seen by reference to Figure 5. Attention is called to the fact that the poles I4 are provided with teeth I8for a purpose hereinafter re'- ferred to. The field coils are insulated from the arm' I6 by a layer of insulation I9. A hand 20 5 adapted to be used as a spinner is secured to the vplate II by a pivot pin 2| which is adapted to rotate between the poles I4 in the interspace between the transparentplates II and I2.

' lThe spinner 20 at its ends is juxtaposed to a circle of vgraduations or marks 22, which marks are adjacent to the teeth of the poles but are placed on the plate II or I2. The armature Il constitutes a stator whereas the spinner 20 constitutes a rotor so that when a field of rotating magnetism; is createdby the stator the spinner 5 28 is caused to whirl or rotate and upon the magnetic field ceases toexist, the hand will stop dead in a position where its ends are adjacent to the teeth of opposite poles. The eld coils I1 are connected in series through an induction coil 23-andv 10 in the circuit is provided a resistance 24 and a switch 25 whereby the circuit is closed. and opened at will. The circuit also contains a plug 26 which is inserted in a Socket constituting the Source of electrical energy. 'I'he induction coil 23, the re- 15 sistance 24 and the switch 25 are mounted in a box 21, and for convenient handling of the device. In use the plug 26 is inserted in a socket not shown whereupon a rotating eld of magnetism is set up in the'iield coilsprovl'ded the 20l switch 25 has been closed, and upon opening of e the switch 25 the circuit is opened, ythe magnetic iield ceases to exist and the hand 20 will remain in a position whereby its ends are held to point toward diametrically opposite teeth of opposed 25' enable visibility of the movement 'of the hand or spinner on the screen, and will furthermore show an exact dead stop ofthe spinner opposite two diametrically opposed graduations. y The drawing shows -a preferred embodiment of Vthe invention, but other modes of actuating the spinner may be used. I, therefore, do not wish to be limited to the details of construction and ar- 40 rangement as shown, but wish. to vclaim my invention as broadly as the state of the art permits.

I'claim: v 1. A stereopticon slide comprising a pair of spaced paralleltransparent plates, a rotor constltuting, a hand pivotally secured to one of said plates and capable of rotation between said plates, and electrical means provided'in the interspace between said plates for causing said rotor to rotate. 50

2. A stereopticon slide comprising a transparent plate, a rotor constituting a hand pivotally y secured thereto, an induction motor secured to said plate and causing-saidl hand to rotate.

,3. A stereopticon slide comprising a pair of spaced transparent plates, a rotor constituting a hand pivotally secured to one of said plates and capable of rotation between said plates, and electrical means arranged between said plates to cause rotation of said hand.

4. A stereopticon slide comprising a pair of spaced transparent plates, a rotor constituting a hand pivotally secured to one of said plates and capable of rotation between said plates and an induction motor arranged between said plates for causing rotation of said hand.

5. Astereopticon slide comprising a pair of parallel spaced transparent plates, a rotor constituting a hand pivotally secured to one'of said plates for rotation thereon and a stator arranged between said plates to constitute said Ahand as 'a rotor.

6. A stereopticon slide comprising a pair of spaced parallel transparent plates, a rotor constituting a hand pivotally secured to one of said plates and capable of rotation between said platea.

electrical means for causing said hand to rotate, and means for ,causing said hand to come toa dead stop at predetermined points.

'LA stereopticon slide comprising a pair of spaced parallel transparent plates, a rotor constituting a hand pivotally secured to one of said plates and capable of rotation, an induction motor between said plates actuating said hand, and means for causing said hand to come to a dead stop at predetermined points. i

EDWARD S. KING. 

